.nav div {
	background-repeat: no-repeat;
	display:inline-block;
	width: 24px;
	height: 24px;
}

a.btn {
	display:inline-block;
	background-repeat: no-repeat;
	width:24px;
	height:24px;
	padding: 0px;
}

.nav div a {
	display:block;
	width: 100%;
	height: 100%;
}

.disabled {
	opacity: 0.25;
}

.btnBack {
	background-image: url("../icon/back.png");
}
.btnForward {
	background-image: url("../icon/forward.png");
}
.btnUp {
	background-image: url("../icon/up.png");
}
.btnDown {
	background-image: url("../icon/down.png");
}
.btnLeft {
	background-image: url("../icon/left.png");
}
.btnRight {
	background-image: url("../icon/right.png");
}
.btnBackRefer {
	background-image: url("../icon/backrefer.png");
}

.btnBoard {
	background-image: url("../icon/board.png");
}

.btnExpand {
	background-image: url("../icon/expandall.png");
}

.btnFirst {
	background-image: url("../icon/first.png");
}

.btnRefresh {
	background-image: url("../icon/refresh.png");
}

.btnSubject {
	background-image: url("../icon/th_subject.png");
}

.btnSingle {
	background-image: url("../icon/th_single.png");
}

.btnDigest {
	background-image: url("../icon/th_digest.png");
}

.btnMark {
	background-image: url("../icon/th_mark.png");
}

.btnGoBoard {
	background-image: url("../icon/goboard.png");
}

.btnGoSubject {
	background-image: url("../icon/gosubject.png");
}
.btnNew {
	background-image: url("../icon/new_post.png");
}
.btnLogin {
	background-image: url("../icon/login.png");
}